Update cv7/program.c

cv7/program.c

@@ -9,31 +9,35 @@
 
 struct tree
 {
-
+  
   char value[SIZE];
   
 
   struct tree *left, *right;
 };
 
-struct tree* read_tree(struct tree* p)
+struct tree* read_tree()
 {
     char buffer[SIZE];
     memset(buffer,0,SIZE);
     char* r = fgets(buffer,SIZE,stdin);
+    
     assert(r);
     struct tree* node = (struct tree*)calloc(1,sizeof(struct tree));
     memcpy(node->value,buffer,SIZE);
-    //printf("\n%s", node->value);
+    
+
+
+    
     node->left=NULL;
     node->right=NULL;
 
     if(node->value[0]!='*')
     {
        
-      read_tree(node->left);
-     
-      read_tree(node->right);
+        node->left=read_tree(node->left);
+      
+        node->right=read_tree(node->right);
     }
     return node;
 }
@@ -43,8 +47,9 @@ void print_tree(struct tree* tree,int offset){
     for (int i = 0; i < offset; i++){
         printf(".");
     }
-    
-    printf("(%s)",tree->value);
+   
+    if(tree)
+        printf("%s",tree->value);
     if (tree->left){
         print_tree(tree->left,offset +3);
     }
@@ -59,8 +64,9 @@ int main(void)
 
     struct tree *tr;
 
-    read_tree(tr);
-    printf("-------");
+    tr=read_tree();
+  
     print_tree(tr,3);
+
   return 0;
 }